Drop us a support ticket, this is something we can normally resolve manually 
Summons a Level 18 Ghoul!
Not a big issue, it’s likely just incorrect text (unless it’s a spoilers for a future update? ^^). The actual troop summoned is still level 15, thankfully.
I’m pretty sure I’ve noticed something similar for another troop as well, probably the Goblin King, but I didn’t come across it lately.
Edit: Should I post this in a separate thread? I’m not sure. If so, sorry.
Yep, Goblin King and Dokkalfar summon higher level minions, which then get chopped off at level 15. 
I think in this regard they are currently the only troops with a kind of “stat threshold” beyond which they do not benefit from gaining magic at all (no, I do NOT count maxed out green slime here 
).
when the update first came out, the summoner over lvl’ed cards would translate to more stats but only lvl 15. now in arena, it is limited and even if you up your magic stat on the summoner, you get a lvl 10 goul.